package gulimall.ware.config;

import org.springframework.cloud.client.ServiceInstance;
import org.springframework.cloud.client.loadbalancer.reactive.ReactiveLoadBalancer;
import org.springframework.cloud.loadbalancer.annotation.LoadBalancerClient;
import org.springframework.cloud.loadbalancer.annotation.LoadBalancerClients;
import org.springframework.cloud.loadbalancer.core.RandomLoadBalancer;
import org.springframework.cloud.loadbalancer.core.RoundRobinLoadBalancer;
import org.springframework.cloud.loadbalancer.core.ServiceInstanceListSupplier;
import org.springframework.cloud.loadbalancer.support.LoadBalancerClientFactory;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.env.Environment;

/**
 * @author HLF
 * @date 2022/4/24 9:08
 */
@Configuration
@LoadBalancerClients(value = {
        @LoadBalancerClient(value = "gulimall-member"),
        @LoadBalancerClient(value = "gulimall-product")
}, defaultConfiguration = LoadBalancerConfig.class)
public class LoadBalancerConfig {

    /**
     * 随机负载均衡策略
     */
    //@Bean
    public ReactiveLoadBalancer<ServiceInstance> randomLoadBalancer(
            Environment environment,
            LoadBalancerClientFactory loadBalancerClientFactory) {
        String name = environment.getProperty(LoadBalancerClientFactory.PROPERTY_NAME);
        return new RandomLoadBalancer
                (loadBalancerClientFactory.getLazyProvider
                        (name, ServiceInstanceListSupplier.class), name);
    }

    /**
     * 默认负载均衡策略(平均分发请求)
     */
    @Bean
    public ReactiveLoadBalancer<ServiceInstance> roundRobinLoadBalancer(
            Environment environment,
            LoadBalancerClientFactory loadBalancerClientFactory) {
        String name = environment.getProperty(LoadBalancerClientFactory.PROPERTY_NAME);
        return new RoundRobinLoadBalancer
                (loadBalancerClientFactory.getLazyProvider
                        (name, ServiceInstanceListSupplier.class), name);
    }
}
